[PYTHON] Build a proxy server with nginx on multiple remote servers using Ansible

Purpose

As the title suggests, use Ansible to build a proxy server with nginx on multiple remote servers. This time I'm using an AWS EC2 instance as the remote server.

Thing you want to do

--Build a server on multiple EC2 instances with one command. --When adding an instance, just add the target IP address.

things to do

What to do when executing the ansible command.

1. Install nginx.
2. Describe the nginx configuration file.
3. Start nginx.
4. Execute 1. to 3. with one command for multiple instances.

Installation

Installed in the local environment to run. Now you can use the command ʻansible-playbook`.

$ pip install ansible

Write a config file

Directory structure

.
|-- webapp.yml
|-- hosts
|-- nginx.conf
`-- myapp.j2

nginx config file

myapp.j2

server {
    listen       80;
    server_name  0.0.0.0;

    location / {
        proxy_pass {{ proxy_pass }};
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        
        proxy_cache zone1;
        proxy_cache_key $proxy_host$uri$args;
        proxy_cache_valid 600s;
    }
}

Prepare nginx.conf in the same directory.

ansible config file

webapp.yml

- hosts: web-servers
  user: ec2-user
  sudo: True

  vars:
    proxy_pass: '<Origin URL>'

  tasks: 
  #Install nginx.
  - name: Install nginx
    yum: name=nginx state=latest
  #Create a cache directory.
  - name: Create Cache
    action: file dest=/var/cache/nginx/cache state=directory owner=nginx group=nginx
  #Local nginx.Copy conf remotely.
  - name: Copy the default nginx config file
    action: copy src=./nginx.conf dest=/etc/nginx/nginx.conf
  #Local myapp.j2 to myapp.Compile to conf and copy remotely.
  - name: Write the original nginx config file
    action: template src=./myapp.j2 dest=/etc/nginx/conf.d/myapp.conf
    #Start nginx.
    notify:
    - Start nginx
  handlers:
    - name: Start nginx
      action: service name=nginx state=restarted

Describe the target host

[web-servers]
54.64.xxx.xxx
54.64.yyy.yyy
54.64.zzz.zzz

Run

$ ansible-playbook ./webapp.yml --private-key ~/.ssh/mykey.pem -i ./hosts

Try using Ansible

If the configuration is as simple as starting a web server, Ansible can be written simply, and when adding the target remote server, it is only added to the hosts file, so I was able to do exactly what I wanted to do :) It's a Python library, but it's also attractive that you only write yaml and ini file-like hosts files. I recommend it because I was able to do it in about 3 hours while watching the tutorial etc .: D